JP2022066167A - Assembly for measuring relative humidity level inside housing of wrist watch case - Google Patents

Abstract

To provide a device for measuring a relative humidity level inside a housing of a wrist watch case.SOLUTION: An assembly 1 for measuring a relative humidity level inside a wrist watch 2 is provided with: a wrist watch 2; and a device 4 for determining the humidity level present in a housing of a case 3 of the wrist watch 2. The determination device 4 is provided with a free space optical system and a control unit 7. The free space optical system 7 includes a radiation module 5 for radiating at least one light beam and a receiver module 6 for receiving at least one light beam. The control unit 7 is connected to the radiation module 5 and the receiver module 6. At least one light beam radiated by the radiation module 5 defines an optical path partially included in the case 3 and extends to the receiver module 6. The control unit 7 evaluates absorption of the light beam by steam that can be present inside the housing of the case 3.SELECTED DRAWING: Figure 1

Description

The present invention relates to an assembly for measuring relative humidity levels inside a wristwatch case.

The water resistance of a wristwatch is measured in bar (bar is a unit of pressure, and 1 bar corresponds to 1 atmosphere (atm)). The water resistance of a wristwatch is often expressed in meters. Wristwatches described as water resistant are intended for normal daily use where resistance to water needs to be guaranteed during activities such as swimming, or simply in the shower. So-called divers' watches need to comply with stricter standards, and according to current standards, they need to guarantee water resistance up to a minimum depth of 100 m.

To ensure water resistance, watches usually have a set of waterproof seals placed at the assembly points of specific parts of the watch, such as the watch's crystal, bezel, back cover, and moving parts, such as crowns and pushbuttons. Is provided. Over time and use, the mechanical properties of the seal may change, reducing the water resistance of the wristwatch. This increases the permeability of the wristwatch to water and water vapor. This can lead to condensation on the inner surface of the wristwatch crystal, or worse, oxidation of certain metal components and deterioration of certain polymer components. Therefore, it is necessary to be able to monitor the relative humidity level inside the watch from time to time, even if it is not always necessary to open the watch, and opening the watch case requires systematic replacement of seals and intervention by the watch manufacturer. Therefore, it costs money. Excessive water vapor inside the watch can indicate that one or more seals need to be replaced in the short to medium term.

To meet this need, some wristwatches are known to include devices for measuring relative humidity levels inside the wristwatch. Such measuring devices take the form of electronic modules capable of measuring and recording the values of various environmental parameters, including relative humidity. Due to their small size, such electronic modules can be placed inside the watch case and the relative humidity level inside the watch case can be measured via a dedicated sensor. The measured relative humidity values can then be transmitted wirelessly to the watch docking station, usually by infrared or radio frequency means. Thus, a signal emitted by an electronic module, such as an infrared signal, passes through a transparent portion of the watch case, usually a crystal, and is received by an infrared sensor at the docking station. Watch users can view the measured relative humidity value using a computer that is connected to the docking station and has dedicated software installed, or using a smartphone.

However, one drawback of such electronic measuring devices is that they require a battery or battery to power the various electronic components. Therefore, such devices are relatively unsuitable, especially for mechanical watches. Furthermore, in the case of an electronic wristwatch, the autonomy of the product is reduced, it becomes necessary to use a large capacity battery, and the volume of the wristwatch may be increased.

Another drawback is that such devices are relatively bulky and are not less noticeable inside a wristwatch. Moreover, such electronic measuring devices are relatively expensive and therefore affect the manufacturing cost of the wristwatch.

Therefore, an object of the present invention is to measure the relative humidity level present inside the watch case by monitoring the relative humidity level inside the case without the need to open the watch case, and thus such a case. It is to provide an assembly that enables the detection of defects in the water resistance of a wristwatch. Such a measurement assembly is cost effective, easy to use, and provides a reliable and fast measurement of the relative humidity level inside the watch case.

To this end, the present invention relates to an assembly for measuring relative humidity levels inside a wristwatch, comprising said the wristwatch and a device for determining the humidity level present within the housing of the case of the wristwatch. The determination device comprises a free space optical system and a control unit, and the free space optical system is
-A radiation module for emitting at least one light beam,
-Includes a receiver module for receiving the at least one light beam.
The control unit is connected to the module and the at least one light beam emitted by the radiation module defines an optical path partially contained in the case and extends to the receiver module, where the control unit is located. , The absorption of the light beam is assessed by the water vapor that can be present inside the housing of the case.

According to other embodiments
-The measurement assembly comprises at least one reflective element that reflects the at least one light beam located inside and / or outside the housing of the case.
-The at least one reflective element, in particular the dial of the case, can reflect the light beam towards the receiver module.
-The measurement assembly features an optical cavity formed by two reflective elements placed facing each other inside the housing of the case.
-The reflective element is reflective at the wavelength of the at least one light beam.
-The first reflective element is defined on a part of the inner surface of the crystal of the case and is placed facing the second reflective element placed on a part of the dial.
-The radiation module can emit multiple light beams simultaneously or continuously at wavelengths with different absorption coefficients in water vapor.
-The radiation module and receiver module are placed facing the crystal of the case and
-If the receiver module is placed facing the back cover of this case, the radiating module is placed facing the crystal of the case.
-If the receiver module is placed facing the crystal of this case, the radiating module is placed facing the back cover of the case.
-The case comprises a crystal, a dial, a movement, and / or a back cover with at least one passage through which the at least one light beam passes.
-The determination device is guided to be confined in a space different from the first space in which the case is located and / or a second space defined inside the housing of the case. Instead, the at least one light beam is configured to move between the radiating module and the receiver module.

The objectives, advantages, and features of this assembly for measuring relative humidity levels inside a wristwatch are more clearly demonstrated in the following description given based on at least one non-limiting embodiment shown in the drawings. Will.

FIG. 1 is a schematic diagram of an assembly for measuring relative humidity levels according to one embodiment of the invention. FIG. 2 is a schematic representation of a first alternative assembly for measuring relative humidity levels configured to perform measurements by reflection according to embodiments of the present invention. FIG. 3 is a schematic second alternative of this measurement assembly comprising a device for determining humidity levels configured to perform measurements by permeation according to embodiments of the present invention. FIG. 4 is a schematic representation of a third alternative of this measurement assembly configured to perform transmission and reflection measurements according to embodiments of the present invention. FIG. 5 is a schematic representation of a fourth alternative of this measurement assembly configured to perform measurements by cavity ring-down spectroscopy according to embodiments of the present invention.

1-5 show some alternatives to assembly 1 for measuring relative humidity levels inside the wristwatch 2. As used herein, "relative humidity level" is understood to mean the ratio of the partial pressure of water vapor contained in air to the saturated vapor pressure at the same temperature. In other words, measuring the relative humidity level corresponds to measuring the ratio of the water vapor content of the air to the maximum water vapor capacity of the air under the same temperature conditions.

The measurement assembly 1 comprises a wristwatch 2, particularly a case 3 of the wristwatch 2, as well as a device 4 capable of determining the humidity level and radiating an optical signal to the case 3. Note that the wristwatch 2 can be any type of wristwatch 2, such as a mechanical wristwatch 2 or an electronic wristwatch 2.

In this configuration, the determination device 4 includes an optical system and a control unit 7. Also called "free space optical system" or "optical system for propagating light beams in free space" or "non-waveguide optical system", this optical system can change the trajectory of the light beam or the characteristics of these beams. It has a set of optical elements. The expression "free space" refers to any spatial medium for routing optical signals, such as, for example, air, outer space, vacuum, or the like. This is different from a material transmission medium such as a waveguide (eg, optical fiber). Such systems do not provide the propagation of light beams in an array of waveguides caused by continuous coupling. In this system, these beams are susceptible to reflection, refraction, scattering, diffraction, or filtering without the use of waveguides.

The system includes a radiation module 5 for emitting at least one light beam 8 and a receiver module 6 for receiving the at least one light beam 8. In some alternatives described below, the optical system may also include at least one reflective element 10, 11, 12a, 12b, also referred to as a "reflective optical element" or "reflector". Such elements 10-12b can in particular deflect the at least one beam 8. Furthermore, it should be noted that such optical systems clearly do not have waveguides such as optical fibers.

Note that in this device 4, the control unit 7 is connected to the modules 5 and 6.

Further, such a determination device 4 is, in particular, a space different from the first space in which the case is located and / or a second space defined inside the housing of the case. It should be noted that the at least one light beam 8 is configured to move between the radiation module 5 and the receiver module 6 without being guided to be confined to (or the medium). In other words, such a determination device 4 is such, in particular, in a first space in which the at least one light beam 8 is located and / or in a second space defined within the housing of the case. It is configured to move between (or through) the radiation module 5 and the receiver module 6, and the at least one light beam is different from this first space and / or this second space. Not guided to be trapped in space (or medium).

Therefore, in such a determination device 4, in particular, the at least one light beam 8 is defined as a first space in which the case is arranged and / or a second space defined in the housing of the case. Is configured to move between the radiation module 5 and the receiver module 6 without being confined to different spaces (or media). Advantageously, such a determination device 4 is, in particular, a first space in which the at least one light beam 8 is located and / or a second space defined within the housing of the case. In (or through) it is configured to move between the radiation module 5 and the receiver module 6, said at least one light beam is the first space and / or the second space. Not trapped in a different space (or medium).

It should be remembered that space (or medium) is a physical element through which the at least one light beam propagates and the at least one beam interacts with. Such interactions result in changes in the properties of the beam. Such a space (or medium) can be air, water, glass, etc. in a non-limiting and non-exhaustive manner.

Under these conditions, the at least one light beam 8 travels in a first space and / or a second space, such as those defined / generated in a waveguide, such as an optical fiber. Do not move in a specific specifically defined / generated space (or medium). The principle of light beam, and more generally light confinement, is that a dielectric space (or medium) embedded in a second space with a lower index of refraction is reflected at the boundary by internal total internal reflection. It should be remembered that it seems to form a trap for. Optical fibers, which are cylindrical optical guides, operate on this principle.

A second space is defined inside the housing of the case, and the boundaries of this second space are defined by components of the case such as the crystal 15 and / or the dial 17, the case back 16, and the central portion 14. Note that it is formed. The movement 18 is also arranged in this second space. It should also be noted that the properties of this second space, in particular the optical properties, may be substantially or exactly similar to the properties of the first space. These properties are, in a non-limiting and non-restrictive manner, the index of refraction of this space (or medium), its transparency (in this case, the term transparency refers to a non-absorbing space (or medium)), Its uniformity (ie, whether the properties of the space (or medium) are the same at all the points that make it up), and its isotropic (ie, the properties of the space (or medium)) are all. Whether or not they are the same in the direction).

Further note that the optical system is located in the first space and the second space.

According to the principles of the invention, such an assembly 1 determines the relative humidity level present inside the housing 9 of the case 3 of the wristwatch 2 from the evaluation of at least one change in at least one characteristic of the light beam 8. For the purpose of measurement, the optical path is partially included in the housing 9. In this case, it was stated that at least one change was a function of the water vapor content contained in this enclosure 9 of Case 3. In other words, the humidity level is determined from the evaluation of the absorption of the light beam 8 by the water vapor that may be present in the air contained in the housing 9 of the case 3. Note that in this case, absorption is measured. This is because, as can be seen below, since the absorption coefficient of the light beam 8 is known, the number of molecules present in the air inside the housing, and thus the density of this air, can be estimated.

Such a case 3 includes, for example, a central portion 14 having an annular shape and having an upper annular edge on which the crystal 15 of the case 3 rests. In the case of the case 3 of the wristwatch 2 shown in the examples of FIGS. 1 to 4, the configuration is substantially circular. However, the present invention is by no means limited to such a configuration of this case 3 of the wristwatch 2. Case 3 further includes a dial 17 provided with time display means.

Further, according to the alternative of the measurement assembly 1, the wristwatch 2, in particular the case 3, can include components such as a crystal 15, a case back 16, a dial 17, and a movement 18, each of which is at least one of the above. It comprises at least one passage through which the light beam 8 passes. Each of these components preferably comprises a first and a second passage, the first passage being in the first direction by the at least one light beam 8 and the second passage being the same reflected light. By beam 8, it is possible to pass in a second direction, which may be the opposite of the first direction. In this case 3, the first passage or the second passage is preferably aligned coaxially. Each of these passages through the dial 17 and the movement 18 can be an opening / recess. The passage through the dial 17 can also be a transparent portion of the dial made of glass, for example mineral glass or sapphire glass. The passage through the dial 17 can be defined over all or part of the dial. In the case of the back cover 16, this passage is preferably a transparent portion of the back cover, which can be made of glass and can be defined over all or part of the back cover 16. This passage through the back cover 16 can also be made of mineral glass or sapphire glass. Such a configuration may be the configuration of a skeleton wristwatch 2 in which the interior of the case 3 and its moving parts are visible on the front of the crystal 15 or on the back through such a back cover 16. In such a wristwatch 2, the at least one light beam 8 emitted by the determination device 4 can pass through the crystal 15 through the housing 9 of the case 3 and exit through the back cover 16.

According to another alternative of the measurement assembly 1, the wristwatch 2, in particular the case 3, comprises an optical cavity 13 formed by at least one reflective element 10, 11 and / or at least two reflective elements 12a, 12b. Can be done. These reflective elements 12a, 12b can be provided with a coating that is non-reflective at wavelengths contained in the visible spectrum but reflective at wavelengths of light beams. This coating can be made of aluminum oxide or titanium dioxide.

Further note that the crystal 15 of this case 3 comprises a passage for the at least one light beam 8 defined over all or part of the crystal 15. Such a passage preferably allows the at least one light beam 8 to pass through the housing 9 without altering the properties of the beam 8 which is variable under the influence of water vapor. The crystal 15 can be a mineral glass or sapphire glass having a thickness of about 5 mm, whereby the at least one light beam 8 having a wavelength contained between 0.2 and 4.5 μm is transmitted. become able to.

In the determination device 4, the radiation module 5 that emits at least one light beam 8 comprises a focused light source capable of emitting a light beam toward the wristwatch 2 via the crystal 15, and the beam 8 is a casing of the case 3. Allows passage through the body 9. This module is preferably a radiation module 5 for radiating at least one laser beam. The wavelength of this laser beam is configured between 2.4 and 3 μm, preferably 2.6 μm. Such a module 5 is capable of pulse-free operation, for example, by including a continuous wave (CW) laser. Such lasers can generate a continuous output beam as opposed to a Q-switched or femtosecond laser that produces pulsed light. The emission module 5 can be configured to perform modulation, especially slower modulation with superposition, in order to improve the signal-to-noise ratio by eliminating noise outside the modulation frequency. Slow frequency offsets can also be provided.

The receiver module 6 comprises at least one optical sensor, particularly the at least one light beam, in this embodiment at least one optical sensor for sensing the laser beam emitted by the radiation module 5. This optical sensor includes at least one photodiode. The receiver module 6 also includes an analog-to-digital converter for converting an analog variable relating to the intensity of the at least one beam 8 into a digital value. When the receiver module 6 is provided with at least two optical sensors, the receiver module 6 is used to reduce the influence of the relative intensity noise of the at least one laser beam or to optimize the dynamic range of the analog-to-digital converter. Note that the difference between the signals transmitted from these optical sensors can be amplified. Such a receiver module 6 can receive the light beam 8 that has moved inside the housing 9 of the case 3.

As described above, the determination device 4 further includes a control unit 7. The control unit 7 can be a computer with at least one processor that works with hardware and software resources, particularly memory elements. The control unit 7 can execute a command for executing a computer program in order to contribute to the determination of the measured value of the relative humidity level inside the housing 9 of the case 3 of the wristwatch 2.

The control unit 7 is connected to the radiation module 5 and the receiver module 6. Such a control unit 7 can control these modules 5 and 6 in order to participate in the determination of the measured value of the relative humidity level inside the housing 9 of the case 3. In particular, the control unit 7 can execute a signal processing operation by signal modulation and synchronization detection operation. The control unit 7 is configured to evaluate the absorption of the light beam 8 by the water vapor that may exist inside the housing 9 of the case 3. Such a control unit 7 may, for example, in its memory element, value the intensity of the light beam 8 and / or absorb the light beam 8 by water vapor to participate in the evaluation of the humidity level inside the case 3. It comprises one or more lookup tables for matching the coefficient to the value of the relative humidity level associated with the value of the beam intensity and / or the absorption coefficient.

In the first alternative of the measurement assembly 1 shown in FIG. 2, the assembly performs a humidity level measurement according to the principle of reflection of the at least one light beam 8 inside the housing 9 of the case 3. It is configured as follows. In this alternative, the radiation module 5 and the reflection module 6 are arranged facing the crystal 15. Therefore, in this context, in this case 3, the crystal 15 is provided with a passage through which the at least one light beam 8 passes not only to the housing 9 of the case 3 but also toward the reflective element 10. To prepare for. Such a reflective element 10 may be included in all or part of the dial 17 of the wristwatch 2. Thus, the at least one light beam 8 begins at the radiation module 5, then through the passage in the crystal 15 through the housing 9, and finally towards the receiver module 6 by the dial 17. Follow the reflected light path.

In a second alternative to the measurement assembly 1 shown in FIG. 3, the assembly 1 performs a humidity level measurement according to the principle of transmission of the at least one light beam 8 through the housing 9 of the case 3. It is configured as follows. In this alternative, the radiation module 5 is placed facing the crystal 15 and the receiver module 6 is placed facing the back cover 16, or the radiation module 5 is placed facing the back cover 16. Arranged, the receiver module 6 is arranged facing the crystal 15. Thus, in this context, the case 3 comprises a crystal 15, a movement 18, a dial 17, and a back cover 16, each of which has its own passage for at least one light beam 8. Therefore, the at least one light beam 8 passes through the housing 9 of the case 3. Note that in such a configuration, the watch 2 can be a skeleton watch 2. Thus, the at least one light beam 8 begins at the radiation module 5, then through the passage in the crystal 15, through the housing 9, and finally through the passage through the back cover 16. Follows the optical path exiting the housing 9 towards the receiver module 6.

In a third alternative to the measurement assembly 1 shown in FIG. 4, the assembly 1 measures the humidity level according to the principle of transmission and reflection of said at least one light beam 8 through the housing 9 of the case 3. Configured to run. In this alternative, the radiation and reflection modules are placed facing the crystal 15 or back cover 16. In this context, the case 3 is located outside the case 3 and comprises a reflective element 11 facing the back cover 16 and further comprises a crystal 15, a movement 18, a dial 17, and a back cover 16, respectively. Two passages, i.e.
-With a first passage in each of them provided for transmission of the at least one light beam 8 passing through the case 3.
-A second passage is provided for each of them provided for the reflection of the at least one transmitted light beam 8 passing through the case 3 again.

In this third alternative, the at least one light beam 8 exits the housing 9 by starting with the radiation module 5 and passing through the first passage through the crystal 15, the dial 17, and the movement 18 in that order. Finally, it exits the housing 9 through a first passage in the back cover 16 and is then reflected by the reflective element 11 into the back cover 16, movement 18, dial 17, and crystal 15. Follows the optical path toward the receiver module 6 again by passing through the housing 9 through the second passage. Note that in this context, watch 2 can be a skeleton watch 2.

In a fourth alternative to the measurement assembly 1 shown in FIG. 4, the assembly 1 is such that the measurement by cavity ring-down spectroscopy 13 of said at least one light beam 8 inside the housing 9 of the case 3 is performed. It is composed of. This fourth alternative implements a spectroscopic technique that allows the optical path within the housing 9 of the wristwatch 2 to be increased, resulting in increased absorption of the light beam 8 by water vapor and thus for measurement. Sensitivity is improved. In this alternative, the radiation module 5 and the reflection module 6 are arranged facing the crystal 15. Thus, in this context, the case 3 comprises an optical cavity 13 with at least two reflective elements 12a, 12b having reflectance at the wavelength of the at least one light beam. The first element is defined on a portion of the inner surface of the crystal 15 and is disposed facing a second reflective element, 12b, located on a portion of the dial 17. In this configuration, the optical properties of the optical cavity 13 vary as a function of the humidity level present inside the housing 9 of the case 3. More specifically, the decay time of this reflectance of the at least one light beam 8 in the cavity 13 after its radiation by the radiation module 5 is stopped is this alternative within the range that establishes a measurement of relative humidity level. It will be considered in the plan. In this alternative, this case 3 has two passages, i.e.
-A first passage provided for transmission of the at least one light beam 8 towards the optical cavity 13 included in the housing 9 of the case 3.
— Further comprising a crystal 15 with a second passage provided for reflection of said at least one light beam 8 coming from this optical cavity 13.

Such first and second passages may be translucent to the visible spectrum and / or semireflecting to infrared light and / or have a reflectance of less than 1.

Thus, in this fourth alternative, the at least one light beam 8 begins at the radiation module 5 and penetrates the optical cavity 13 by passing through a first passage within the crystal 15, and finally a second. It follows the optical path through the crystal 15 and out of the optical cavity 13 towards the receiver module 6 through the passage of 2.

It should be noted that the longer the length of the optical path portion included in the housing 9 of the case 3, the higher the accuracy of the humidity level measurement performed by the measurement assembly 1.

In the determination device 4, the radiation module 5 can emit a plurality of light beams simultaneously or continuously at wavelengths having different absorption coefficients in water vapor. For example, the wavelengths of these beams can be about 2.3 and 2.6 μm.

Further, the determination device 4 can be a portable or mobile device, i.e., a device 4 that can be carried by the user without the need for a wired connection for its power source.

On the other hand, the determination device 4 may include a display element capable of displaying a plurality of different visual signals according to the value of the relative humidity level determined by the control unit 7. Therefore, in some cases, each visual signal displayed by the display element corresponds to a predetermined relative humidity level value or a predetermined relative humidity difference value. This display element can be a screen with a light emitting diode, or more simply, a light indicator with a light emitting diode, and the illumination of a given diode corresponds to a given relative humidity threshold. do.

1 Measurement assembly 2 Watch 3 Case 4 Judgment device 5 Radiation module 6 Receiver module 7 Control unit 8 Light beam 9 Housing 10 Reflective element 11 Reflective element 12a First reflective element 12b Second reflective element 13 Optical cavity 14 Central part 15 Crystal 16 Back cover 17 Dial 18 Movement

Claims (11)

An assembly (1) for measuring the relative humidity level inside the wristwatch (2), which is present in the wristwatch (2) and the housing (9) of the case (3) of the wristwatch (2). A device (4) for determining the humidity level is provided, the determination device (4) includes a free space optical system and a control unit (7), and the system is described.
-A radiation module for emitting at least one light beam (8),
-Includes a receiver module (6) for receiving at least one light beam (8).
The control unit (7) is connected to the module (5, 6), and the at least one light beam (8) emitted by the radiation module (5) is partially included in the case (3). The optical path is defined and extends to the receiver module (6), and the control unit (7) is the light beam due to water vapor that can be present inside the housing (9) of the case (3). Assembly (1) configured to evaluate absorption in (8). At least one reflective element (10, 11) that reflects the at least one light beam (8) arranged inside and / or outside the housing (9) of the case (3). 1) The measurement assembly (1) according to claim 1. The at least one reflective element (10, 11), in particular the dial (17) of the case (3), is capable of reflecting the light beam (8) towards the receiver module (6). The measurement assembly (1) according to claim 2, wherein the measurement assembly (1) is characterized. 1. The first aspect of the present invention is characterized by comprising an optical cavity (13) formed by two reflective elements (12a, 12b) arranged so as to face each other inside the housing (9) of the case (3). Alternatively, the measurement assembly (1) according to claim 2. The measurement assembly (1) according to claim 4, wherein the reflective elements (12a, 12b) are reflective at the wavelength of the at least one light beam (8). The first reflective element (12a) is defined on a part of the inner surface of the crystal (15) of the case (3) and is arranged on a second reflective element (12b) arranged on a part of the dial (17). The measurement assembly (1) according to claim 5, wherein the measurement assembly is arranged facing each other. The radiation module (5) is characterized in that a plurality of light beams can be emitted simultaneously or continuously at wavelengths having different absorption coefficients in water vapor, according to any one of claims 1 to 6. The measurement assembly (1) described. One of claims 1 to 7, wherein the radiation module (5) and the receiver module (6) are arranged facing the crystal (15) of the case (3). The measurement assembly (1) according to the above. -When the receiver module (6) is arranged facing the back cover (16) of the case (3), the radiation module (5) faces the crystal (15) of the case (3). Placed in
-When the receiver module (6) is arranged facing the crystal (15) of the case (3), the radiation module (5) faces the back cover (16) of the case (3). The measurement assembly (1) according to any one of claims 1 to 8, wherein the measurement assembly (1) is arranged. The case (3) has a back cover (16) comprising a crystal (15), a dial (17), a movement (18), and / or at least one passage through which the at least one light beam (8) passes. The measurement assembly (1) according to any one of claims 1 to 9, wherein the measurement assembly (1) is provided. The determination device (4) is confined in a space different from the first space in which the case is located and / or a second space defined inside the housing of the case. The claim is characterized in that the at least one light beam (8) is configured to move between the radiation module (5) and the receiver module (6) without being guided in such a manner. The measurement assembly (1) according to any one of items 1 to 10.

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